Bolling mill



Aug. 25, 1925. 1,551,486

J. HIRSCHMANN ROLLING MILL Filed Oct. 22, 1920 I I I I i a INVENTOR v Jrm T:

Patented Aug; 25,1925

STATES JOSEF HIRSCHMANN, OF ESPYVILLE, PENNSYLVANIA.

ROLLING MILL.

Application filed October 22, 1920. Serial No. 418,700. I

To all whom it may concern:

Be it known that I, Josnr HIRsoHMANN,

a citizen of the United States and resident of Espyville, in the county of Crawford and.

State of Pennsylvania, have invented a new and useful Improvement in Rolling Mills; and I dohereby declare the following to be a full, clear, and exact'description thereof.

My invention relates to rolling mllls and is particularly adapted for the rolling of sheet-metal although I do not wish to limit it to this particular product.

In mills of this character as heretofore constructed Where a two high mill with a balanced top roll is used, it was generally necessary to use a stand of pinions to transmitthe power to the top roll. These pinions were constructed with teeth strong 7 object I provide a mechanism for driving the'upper roll of" themill independently of the lower roll which is broadly the gist of my invention.

In the accompanying drawing Fig. 1 is a longitudinal vertical elevation of a mill showing my invention. applied thereto, the housing of the mill proper being partly shown in section; and Fig. 2 is a section on the line 2-2, Fig. 1.

In the drawing the numeral 2 designates a suitable bed-plate or shoe provided with the spring bearings 3 which support the spindle 4 for driving the lower rolls. In the drawing 1 have shown one pair of rolls in full and another pair partly broken away, the spindle 4 forming a driving connection from the bottom roll of one pair to the bottom roll of the next pair.

The spindle 4c is connected up to the lower rolls 6 in the ordinary manner by the usual coupling boxes 5.

The roll-housings 7 are of the ordinary construction in which the rolls are journaled and, as in the case illustrated where a balanced millis employed, the upper roll'8 is supported in a bolster 9 supported on bars 10 which are connected with a system of levers 11 and 12 and balance Weights 13 suspended beneath ,the bed-plate, and which balance weights are suflicient to lift the top roll as the feed-screws 14 are turned back so as to keep the roll constantly in contact with its top bearing.

Bolted. to the shoe flare .the castings 15 which form a support for the bed-plate 16 which is bolted thereto and which forms a support for the mechanism for driving the top roll 8.

A suitable electric motor 17 of requisite power is bolted to the bed-plate 16, and the motor shaft 18is connected up by the suitable semi-universal coupling 19 to the geartransformer 20 which may be of any suitable construction to reduce the high speed of the motor and provide power enough to keep the upper roll at the same speed as the lower roll when no metal is passing through the mill. As any suitable form of gear-transformer maybe employed it has not been deemed necessary to illustrate the same in detail.

A spindle 21 connects with the gear-transformer through a friction coupling 21 to the top roll 8 for driving same, and said spindle has at its outer end a coupling 22 which fits over the wabbler-end of the top roll, there being suliicient play between said coupling and said end to allow for considerable play to prevent the shock created by the metal leaving the roll from being transmitted to the gears in the gear-transformer.

in this manner a sudden stress on the gears in the gear-transformer is practically elimi nated.

As the upper roll is thus operated by independent power from that which operates the lower roll it is not necessary to have the upper roll rotating when the mill is not in use which creates a great saving in power and at the same time a saving in the wear of the parts,

When my improved mill is in operation in the rolling of metal, the lower roll is driven in the ordinary manner from the mill engine through the spindle 4, and the upper roll is'driven independently by power transmitted from the motor 17 through the geartransformer 20. As above stated, the motor only needs to supply power enough to keep the upper roll at the same speed as the lower roll when no metal is passing through the rolls, but just as soon as the metal enters the rolls the upper roll is driven by friction of the metal passing between it and the bottom roll.

By my invention I am able to dispense with the massive pinions and pinion housings ordinarily employed for driving the top roll positively from the bottom roll together with the expense of such installation and furthermore, doing away with the necessity of having the upper roll in operation when the roughing stand is not in use. Heretofore, in a train of rolls all the top rolls of the diflerent trains were continuous- 1y driven due to their being connected up by ,the pinions, but by my invention the upper roll of any stand of a train may be stopped when the stand is not in use, thereby creating a great saving in power as well as in wear and tear.

What I claim is:

1. In a bar rolling mill, the combination of cooperating upper and lower rolls, power drive means connected to the lower roll inde pendently of the upper roll for operating the mill, and idler means connected independently to the upper roll, for lightly turning the same to initiate feed of the plate and permit subsequent driving of the upper roll fII'OIH the lower roll through friction of the ate. p 2. In a. bar rolling mill, the combination of cooperating lower and upper rolls mounted out of contact, means for exerting great pressure on the rolls, power means to rotate the lower roll to drive the work through the mill, a light motor independent of the power means and the lower roll for driving the upper roll, a reduction gear between the light motor and the upper roll,.a loose coupling in the upper roll drive adjacent the upper roll, and a friction coupling located between the loose coupling and the reduction gear,

3. The combination with a two-high sheet rolling mill stand having a drive for its bottom roll, of a separate motor drive connection for the top roll, said connection comprising a motor, a reducing gear, a slip device, and a universally jointed shaft coupled to said roll, substantially as described.

In testimony whereof I, the said JosEF HIRSCHMANN, have hereunto set my hand.

JOSEF HIRSCHMANN. 

